1. College of Astronautics, Northwestern Polytechnical University, Xi'an 710072, China; 2. Xi'an Aerospace Propulsion Institute, Xi'an 710100, China; 3. Xi'an Aerospace Yuan Dongli Engineering Co., Ltd, Xi'an 710100, China; 4. School of Energy and Environment, Anhui University of Technology, Maanshan 243032, China
Abstract：Combining with the research of SO2 mass transfer in the process of ammonia-based desulfurization, the CFD calculation method which could calculate the SO2 removal efficiency was developed with the CFD secondary development technique by coupling the multi-component chemical reaction in the ammonia desulfurization droplet, the mass transfer between the droplet and the gas phase (double membrane theory), and the droplet evaporation phase change. The three-dimensional model was established based on this method could calculate the flue gas flow rate, pH value, liquid-to-gas ratio, atomized particle size, and initial SO2 concentration on the desulfurization effect. The results show that the simulation results and the experimental data have the similar tendency varying with the operational factor and the relative error between the two is less than ±20%. By calculating the influence of key parameters such as pH value and slurry particle size on the distribution of NH3 and SO2 concentration on the vertical centerline in the desulfurization tower, the pH and particle size of the slurry can be controlled to improve the desulfurization efficiency and reduce the NH3 escape. The experimental and numerical simulations results show that the recommended flue gas flow rate is 2~3m/s, the slurry pH value is 5~6, gas-liquid ratio is 2.5~3.5L/m3 and the atomized particle size is 0.8~1mm for the ammonia desulfurization system.
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